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Avalanche

Wed May 09 2007, 07:09PM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

haha, blow the faulty chip off the board at the same time!

We do something similar to diagnose faulty return boards, but it isn't as destructive. On the larger boards, we use a thermal imager and slowly increase the current. If an ic or other component has failed shortcircuit, it can be seen clearly, along with the heated pcb traces leading up to it. It has all kinds of other nifty uses too, I keep meaning to download some of the pictures so I can post them in this thread...

Marko

Wed May 09 2007, 07:29PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

BlackPlasma wrote ...

Firkragg, your work with that double-sided protoboard is always so neat... Great work! I wish I could get my stuff on protoboard to look that pretty, if it ever works, that is. :P

Thanks matt.. perforated board (especially double-sided) is expensive, so I try to save every cm of it if I can. (wich sometimes creates more trouble than good

)
I barely started etching real PCB's around this time so I definitely won't be beating you at that part.

ShawnLG

Thu May 10 2007, 02:38AM

Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399

That is a cool little SMP Firkragg. What is it's output ratings?

Simon

Thu May 10 2007, 04:39AM

Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549

Avalanche wrote ...

It has all kinds of other nifty uses too, I keep meaning to download some of the pictures so I can post them in this thread...

That would be kind of neat.

Ragnarok

Thu May 10 2007, 08:57AM

Registered Member #659 Joined: Fri Apr 20 2007, 09:14AM
Location: SW Hertfordshire, UK
Posts: 75

Well, there're not that great, but here are some of my cool pictures of
spudgun related destruction. (Click on them for the full size version)

The cannon involved is a pneumatic type called Behemoth, and is fairly widely accepted as one of the most powerful in it's calibre in the UK due to it's custom valve design. If you want to see the cannon, it can be seen here.

This picture involved experimenting with various projectiles versus 1mm steel plate (from a broken DVD player):

The holes and deep dents are mostly from solid steel rounds. The other dents result from paintballs, potato and grapes. (It has put paintballs to Mach 0.8 so far.)

And a frozen grape put through a wooden plank:

However, this power pales before the designs I have for the next cannon which should be finished in a day or so.

Marko

Thu May 10 2007, 07:35PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

ShawnLG wrote ...

That is a cool little SMP Firkragg. What is it's output ratings?

Actually it's currently 0W rating since it almost blew up when I plugged it in.

I mixed up pins 1 and 2 on the UC3842 and feedback didn't work.. fortunately all components except one zener are fine.
The controller and mosfet gate seen more than 30V of Vcc and didn't blow up O_o

The another one I built worked happily as I plugged it in adn gives some 20W of power.
Output voltage is variable for some 3-20V and current is pulse-by-pulse limited.

Dr. Drone

Thu May 10 2007, 11:58PM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
Location:
Posts: 1673

Avalanche

Mon May 14 2007, 06:07PM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

Boss was out this afternoon, so I got out the thermal imager and had a bit of a play around!

My mug of hot chocolate... Seemed to become drinkable when the surface hit about 65*C, it started out at 75*C!

Soldering iron, only a few seconds after switching on.

Here's my laptop, you can tell where they put the ccfl! The hard drive is towards the left of the case

And here's what we actually use the imager for. This board looks like it has some serious design issues with those hot spots, especially when mounted in an enclosure.

I'll do some more if I can think of anything. I was messing around with a piece of copper pipe as well, watching the path that the heat took on the screen of the imager. It would be interesting to see how an sstc fullbridge heated up, I'd do that if I had one handy.

Alex

Mon May 14 2007, 08:57PM

Geometrically Frustrated
Registered Member #6 Joined: Thu Feb 02 2006, 04:18AM
Location: Bowdoin, Maine
Posts: 373

That's pretty neat! thedatastream (I think) took some pictures with a FLIR camera that he was working on, lemme see if I can find the thread...

Awww, the pictures are gone.

Bjørn

Mon May 14 2007, 10:03PM

Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058

but even better there is a picture from his expedition to Peru where he proved that lake Titicaca consists of 100% beer.

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